adding filled polygon. Add support for stroke on Polygon #76
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@ladyada
Resolves: #63
I opted to make a new FilledPolygon class instead of adding support to existing Polygon directly so that anyone who wants to use the traditional one doesn't have to gain the overhead of an extra Group, or have their code broken if it used some of the superclass TileGrid's attributes.
Not strictly related to the fill support, but I also added the ability to set a
stroke
on the existing Polygon (and the new FilledPolygon). All of the other shapes support a stroke value for the thickness of their outline, but Polygon didn't before.